The Antarctic ozone hole was the largest ever in 2000 (>28 million km2, http://pao.gsfc.nasa.gov/gsfc/EARTH/environ/ozone/ozone.htm). Significant trends of increasing UV-B related to ozone depletion have also been observed at Arctic and north temperate latitudes [5-7]. Modeling efforts estimate that localized losses of column ozone may be as high as two-thirds of the Arctic ozone column in the years 2010-2019. Atmospheric processes related to climate change are also influencing stratospheric ozone depletion. In particular, greenhouse gases are expected to enhance radiative cooling of the lower stratosphere and increase stability of the Arctic polar vortex, creating conditions that will further aggravate ozone depletion [6,8]. Recovery from ozone depletion and elevated UV is likely to be slow over the next half century .
At the same time that stratospheric ozone has been depleted, there is evidence that increases in tropospheric ozone and other pollutants in the lower levels of the atmosphere have contributed to decreases in incident UVR in highly populated and industrialized urban areas [10-13].
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